Razor honing device



Oct. 19, 1948. v. MUNNO RAZOR HONING DEVICE Filed April 12, 1946.INVENTOR V form of the invention removably Patented Oct. 19, 1948UNITED: sr rss- PATENT OFFICE 2,451,860 "RAZORHONING DEVIGE *VincentMunndillo bojken, ,N. J. Application A ron, 1946, Serial 1%..661318 Thisinvention relatesin general toua honing device and in particular toahoning device for sharpening precision tools such as razors, scalpelsand the like.

Thisinvention contemplates a precision honing device for refinishingexceptionally sharp. and

even. cutting edges on razors, surgical instruments and the like whereinit is necessaryto have particularly sharp and smooth cutting edges.Accordingly it is an object of this invention to provide a precisionhoning. device.

It is another object of th-is invention toprovide a precision honingdevice having a. plurality of rotating members adapted toreceivewandsharpen a precision cutting 15001.,

It is a further object of this inventionto provide pended claims inwhich the various novelfeatures of the invention are more particularlysetv forth.

In theaccompanying drawing iorminga material part of this disclosure: p

Fig. 1 is: a perspective View of 8a, precision honing device accordingto invention. 7

Fig. 2 is an end cross section of the articles shown. in Fig- 1, takenalong the line 2- -2.

Fig. 3 is a side elevational view of the article shown in Figs. 1 and'2. l

- Fig. 4 isa perspective view of arprecision honing device according toa. somewhat difierent form of this invention whereinthedevice isremovably mounted on a work bench orthe-likew r Fig. 5 is a perspectiveview of a still further mounted on a work bench or the like. i

Fig. 6 is a plan view of a blank which isadapted to be shaped to formthe article shown in Fig. 5.

Fig. 7 is a perspective view of an adjustable preoision, honing, deviceaccording to astill further form of this invention. i i

Fig. 8 is an end cross sectionof the device shown in Fig. '7, takenalongthe line .8-8.

Fig. 9 is an enlarged fragmentary crosssection one form of this 3Claims. (01. 51-214) I ofthe adjustable means inthe device accordingto,:Figs. 7 and 8. 1 i

, Referring-to the figuresin detail there isrshow-n in Figs. 1-3, aprecision honing device generally designated l0 comprising a stem ormounting member H havingadamp-like frame 12 positionedthereon. A pair ofsphericalsharpening members ['3 are rotatably mounted in clamp: l2 andare positioned to bear against one another.

The stem H is a suitable and convenienthandle or mounting member adaptedto fit, according'to the particular needs, into aconventionalmounting-clamp or the like or alternatively adapted to beheld in an operators hand. This stemlmay be constructed of WOOd,, metal,plastic orother similar relatively stiff and sturdy structuralmaterials. '1 The clamp on frame |2 comprises a base '14 which issecured to stem H and which has two side or: arm members l5 rising fromthe sides thereof and facing one another. Near-the top or 'free end ofarm [5 are two-holes orrecesses Hi, one :hole in each of arm members l5.Theseholes 1 6 arepositioned directly opposite one another and areadapted to receive sphericalmembers i l.

Spherical members I3 comprise relatively hard and precision formed ballshaving a diameter substantially larger than the diameter of holes 516*.These spherical members I3 are positioned in holes LB and on the innersides of arms 15 whereby members 13 bear'against one another. Thesemembers are loosely positioned in holes l6 and therefore are adapted torotate therein.

Clamp I2 is constructed of astrong and resilient material, such asspring steel or thelike whereby-it is adapted to retain sphericalmembers l3 firmlyyet springablyin position.

.Spherical members I3 are constructed of a hardened steel or similarhard material, and are substantially harder thanthe adjacent arm membersH, as well as being substantially harder than conventional Icuttingmembers such as razor blades and the like. These spherical members H areaccurately formed to a nearlyperfect spherical shape, substantially freefrom irregularities and defects.

In use andoperation the device shown in Figs. 1.-3 is firmly grasped in,the operator's hand or alternatively, and preferably, is securelyfastened to .a :work. bench or the like, and the instrument to besharpened is carefully and slowly passed through: the honing-device,placing the sharp-cutting edge between spherical members H. The cuttingedge is passed between spherical members l3 once or several times untilthe, edge is thoroughly and satisfactorily sharpened.

In Fig. 4, there is shown a somewhat different form of this invention,wherein stem II is omitted from the structure. In this form of theinvention, a honing device comprising a clamp [2 having parallel placingarms IS in which are mounted spherical members l3 in a structure similarto that describe-d in Figs. 1-3. The bottom of clamp i2 is substantiallyflat whereby it is adapted to be positioned directly on a flat surface.

There is likewise provided an adjustable clamp l1 preferably a C clampor the like. One arm 18 of this clamp is adapted to be positioned abovethe base I4 of member I2 and the other arm I9 of clamp I1 is adapted tobe positioned below a work table 29 or other similar surface. Thumbscrew 2| or the like serves to releasably secure the honing device tothe upper surface of table 20, as shown in Fig. 4.

The use and operation of this form of the device is similar to thatpreviously described, with the honing devic being mounted on the uppersurface of a work table and a precision cutting tool being sharpenedthereon as previously de scribed.

In Figs. 5 and 6, there is shown a somewhat different form of theinvention wherein clamp l1, according to Fig. 4, is formed as anintegral part of the honing device H). In this form of the invention thehoning device comprises blank 22 of spring steel, as shown in Fig. 6, inthe form of a T having two holes or recesses l6 near opposite ends ofthe cross bar of the T and having a small threaded hole 23 near the faceor stem of the T.

The blank is opened along dotted lines, as shown in the figure, witharms l5 of the cross bar being bent upwardly at right angles and withstem 24 of the T being bent downwardly at right angles. The bottomportion 25 of the stem 24, containing hole 23 is further bent backwardsat right angles whereby it is positioned directly beneath and parallelwith the central or crossing portion I 4 of the T. The finishedformation is shown in Fig. 5.

The thumb screw 2W or the like is passed through threaded hole 23whereby there is formed an adjustable clamp for securing the device to awork table or the like. A pair of spherical members l3 are positionedbetween arms l3, restin in holes l6 therein in a structure similar tothat shown in connection with the previou figures. The use and operationof this device is similar to that previously described.

' In Figs. 7-9, there is shown a still further form of this inventionwherein the tension acting on spherical members [3 i adjustable. Thestructure is similar to that shown in the previous figures, inparticular the structure shown in Figs. 1-3, with the exception that atension adjusting means 21 is mounted between arms H: at a pointsubstantially half Way between spherical meme hers I 3 and base I 4 ofthe device.

According to this form of the invention, this adjusting means 21comprises bolt 28 having a right handed thread thereon mounted in onearm 15 and a bolt 29 having a left handed thread thereon mounted in theother arm l5" (see Fig. 9)

effective additive length of bolts 28 and 29 is increased or decreasedas desired, As the length of bolts 28 and 29 is decreased arms |5 areallowed to come together whereby the full tension of the clamp 12 iscaused to act on spherical members l3. As the effective length of bolts28 and 29 is increased an accurately adjusted proportion of this tensionis removed from spherical members |3.

The use and operation of this device is similar to that shown inconnection with the previous figures with the exception that there isavailable a fine adjustment of the characteristics of the honing device.For relatively coarse work, the tension of the device is tightenedwhereby spherical members I3 are caused to bear relatively firmlyagainst one another. For the final and exceptionally fine sharpening,collar 30 is adjusted to cause spherical members l3 to bear against oneanother only lightly whereby an extremely sharp'cutting edge may beformed on the tool which is being sharpened.

While I have illustrated and described the preferred embodiments of myinvention, it is to be understood that I do not limit myself to theprecise constructions herein disclosed and the right is reserved to allchanges and modifications coming within thescope of the invention asdefined in the appended claims.

Having thus described my invention, what I claim as new, and desire tosecure by United :States Letters Patent is:

1. In a honing device having a U-shaped frame rotatively supporting apair'of balls in contact with each other adjacent theouter free ends ofthe flexible arms of said frame, means for varying the spacing of saidarms to vary the pressure with which the balls engage each other,comprising bolts non-rotatively mounted in axial alignment on the innerfaces of said arms and directed toward each other, said bolts havingthreads of opposite hand, and a tubular collar having said boltsthreadedly engaged into its ends, whereby the collar may be turned inone direction to extend the bolts and spread the arms to reduce thepressure on the balls and in the opposite direction to draw the boltstogether and relieve the arms to increase the pressure on the balls.

2. In a honing device having a U-shaped frame rotatively supporting apair of balls in contact with each other adjacent the outer free ends ofthe flexible arms of said frame, means for varying the spacing of saidarms to vary the pressure with which the balls engage each other,comprising bolts non-rotatively mounted in axial alignment on the innerfaces of said arms and directed toward each other, said bolts havingthreads of oppositehand, and a tubular collar having said boltsthreadedly engaged into its ends, whereby the collar may be turned inone direction to extend the bolts and spread the arms to reduce thepressure on'the balls and in the opposite direction to draw the boltstogether and relieve the arms to increase the pressure on the balls,said tubular collar having its outer surface knurled to facilitategripping the same for turning purposes.

3. In a honing device having a U-shaped frame rotatively supporting apair of balls in contact with each other adjacent the outer free ends ofthe flexible arms of said frame, means for varying the spacing of saidarms to vary the pressure with which the balls engage each other,comprising bolts non-rotatively mounted in axial align- 5 ment on theinner faces of said arms anddirected toward each other, said boltshaving threads of opposite hand, and a tubular collar having said boltsthreadedly engaged into its ends, whereby the collar may be turned inone direction to extend the bolts and spread the arms to reduce thepressure on the balls and in the opposite direction to draw the boltstogether and relieve the arms to increase the pressure on the balls,said bolts having their outer ends irregularly shaped and extended intomating recesses formed in the inner faces of said arms preventingrotation of said bolts relative to said arms.

' VINCENT MUNNOH 8 anmsuczs ormn The following references are of recordin the file of this patent:

UNITED STATES PATENTS Number Name Date 1,340,509 Watson May 18, 19201,353,485 McGall Sept. 21, 1920 FOREIGN PATENTS Number Country Date109,593 Great Britain Sept. 18, 1916 191,380 Great Britain Qct. 4, 1923161,116

Switzerland Julie 16, 1933

